Abstract
The operation of nonisothermal jacketed continually stirred tank reactors (CSTRs) involves a high degree of nonlinearity, and for certain operating conditions this nonlinearity may cause concentration multiplicity at steady state. At these conditions, certain steady states will be unstable and difficult to observe and maintain. The dynamics of the cooling jacket has a profound effect on these conditions and hence should be taken into consideration for the proper reactor design. A novel steady-state design algorithm is presented here to stabilize the CSTR at such conditions. This is achieved by replacing the single CSTR by a cascade of reactors that are capable of stabilizing and maintaining the unstable steady state. The new design approach implements an optimization of the reactors operating parameters to achieve this solution. The implementation of the solution algorithm is shown graphically and also shown is the use of numerical computational optimization solution techniques. For a first order reaction, both solutions were successful at achieving the unstable steady state; however, the numerical solution was more accurate. Simulations of the new design showed that the reactors' cascades were capable of stabilizing the metastable temperature to a high degree of accuracy.
| Original language | English |
|---|---|
| Pages (from-to) | 7631-7636 |
| Number of pages | 6 |
| Journal | Industrial and Engineering Chemistry Research |
| Volume | 48 |
| Issue number | 16 |
| DOIs | |
| Publication status | Published - Aug 19 2009 |
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ASJC Scopus subject areas
- Chemical Engineering(all)
- Chemistry(all)
- Industrial and Manufacturing Engineering
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An algorithm for stabilizing unstable steady states for jacketed nonisothermal continually stirred tank reactors. / Mjalli, Farouq S.; Jayakumar, N. S.
In: Industrial and Engineering Chemistry Research, Vol. 48, No. 16, 19.08.2009, p. 7631-7636.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An algorithm for stabilizing unstable steady states for jacketed nonisothermal continually stirred tank reactors
AU - Mjalli, Farouq S.
AU - Jayakumar, N. S.
PY - 2009/8/19
Y1 - 2009/8/19
N2 - The operation of nonisothermal jacketed continually stirred tank reactors (CSTRs) involves a high degree of nonlinearity, and for certain operating conditions this nonlinearity may cause concentration multiplicity at steady state. At these conditions, certain steady states will be unstable and difficult to observe and maintain. The dynamics of the cooling jacket has a profound effect on these conditions and hence should be taken into consideration for the proper reactor design. A novel steady-state design algorithm is presented here to stabilize the CSTR at such conditions. This is achieved by replacing the single CSTR by a cascade of reactors that are capable of stabilizing and maintaining the unstable steady state. The new design approach implements an optimization of the reactors operating parameters to achieve this solution. The implementation of the solution algorithm is shown graphically and also shown is the use of numerical computational optimization solution techniques. For a first order reaction, both solutions were successful at achieving the unstable steady state; however, the numerical solution was more accurate. Simulations of the new design showed that the reactors' cascades were capable of stabilizing the metastable temperature to a high degree of accuracy.
AB - The operation of nonisothermal jacketed continually stirred tank reactors (CSTRs) involves a high degree of nonlinearity, and for certain operating conditions this nonlinearity may cause concentration multiplicity at steady state. At these conditions, certain steady states will be unstable and difficult to observe and maintain. The dynamics of the cooling jacket has a profound effect on these conditions and hence should be taken into consideration for the proper reactor design. A novel steady-state design algorithm is presented here to stabilize the CSTR at such conditions. This is achieved by replacing the single CSTR by a cascade of reactors that are capable of stabilizing and maintaining the unstable steady state. The new design approach implements an optimization of the reactors operating parameters to achieve this solution. The implementation of the solution algorithm is shown graphically and also shown is the use of numerical computational optimization solution techniques. For a first order reaction, both solutions were successful at achieving the unstable steady state; however, the numerical solution was more accurate. Simulations of the new design showed that the reactors' cascades were capable of stabilizing the metastable temperature to a high degree of accuracy.
UR - http://www.scopus.com/inward/record.url?scp=69249086072&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=69249086072&partnerID=8YFLogxK
U2 - 10.1021/ie900072g
DO - 10.1021/ie900072g
M3 - Article
AN - SCOPUS:69249086072
VL - 48
SP - 7631
EP - 7636
JO - Industrial & Engineering Chemistry Product Research and Development
JF - Industrial & Engineering Chemistry Product Research and Development
SN - 0888-5885
IS - 16
ER -